1. Mint Marks: The 1964 Kennedy Half Dollar was minted in three locations: Philadelphia (no mint mark), Denver ("D" mint mark), and San Francisco ("S" mint mark). The San Francisco mint produced fewer coins that year, making them potentially more valuable than those minted in Philadelphia or Denver.
2. Condition: The preservation and appearance of the coin play a crucial role in its value. Coins in mint condition (MS-65 or higher), with no visible wear, marks, or scratches, are more valuable than circulated or worn coins.
3. Rarity: Certain 1964 Kennedy Half Dollar coins may have specific characteristics that make them rarer. For example, coins with errors, such as die breaks, double die strikes, or wrong planchets, can command higher prices due to their rarity.
4. Collectibility: Kennedy Half Dollars, especially those in good condition or with significant mint marks, are sought after by collectors. If a particular 1964 coin is scarce and in demand, its value can increase due to its collectibility.
Here are approximate value ranges for 1964 Kennedy Half Dollars in different conditions and grades:
- Circulated (Common Dates): $1 - $5
- Uncirculated (MS-60 to MS-64): $5 - $15
- Mint State (MS-65 and higher): $20 - $100+
- Proof Coins: $100 - $200+
Additionally, the market value of coins can fluctuate and change over time based on supply, demand, and overall economic conditions. It's recommended to consult with a professional coin dealer or refer to reputable coin catalogs and resources to obtain accurate and up-to-date pricing information.